Bacon & Blue Cheese Pierogies

all purpose flour

salt

egg, lightly beaten

light sour cream

plain Greek yogurt

cold unsalted butter, cut into small pieces

onion, very finely minced

medium russet potatoes, washed, peeled, and cut into uniform pieces

milk (plus more to desired consistency)

salt & pepper

slices low sodium bacon

olive oil

mushrooms, chopped

gorgonzola cheese

butter

green onions to garnish

light sour cream for serving